You are what you eat. Note this quote, and remember it at every meal.
First I would like to write about whole grain foods, this is very basic and simple thing, but it makes your life much heathier.

What is a Whole Grain? All grains start life as whole grains. In their natural state growing in the fields, whole grains are the entire seed of a plant. This seed (which industry calls a “kernel”) is made up of three key edible parts – the bran, the germ, and the endosperm – protected by an inedible husk that protects the kernel from assaults by sunlight, pests, water, and disease.

Whole grains are healthier. Whole grains contain all three parts of the kernel. Refining normally removes the bran and the germ, leaving only the endosperm. Without the bran and germ, about 25% of a grain’s protein is lost, and are greatly reduced in at least seventeen key nutrients. Processors add back some vitamins and minerals to enrich refined grains, so refined products still contribute valuable nutrients. But whole grains are healthier, providing more protein, more fiber and many important vitamins and minerals.